Silence byte-compiler dealing with replaced function

[tarsius]

In [1: 34b35c0] we started to use the function/macro available in the current Emacs version. This commit additionally keeps the byte-compiler from reporting that the other is undefined.

1: 2023-01-03 34b35c0ba0f4d0658705591467617e9d7b3c516c Use ‘reb-target-value’ instead of ‘reb-target-binding’ if available